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Re: How do you programmatically create datasources in JBoss5
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created by <a href="http://community.jboss.org/people/tcoup">Tom Coupland</a> in <i>Datasource Configuration</i> - <a href="http://community.jboss.org/message/624249#624249">View the full discussion</a>
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<div class="jive-rendered-content"><p>Following 'fans xnet's excellant advise i did create a factory. I even (eventually) worked out what to put in it!</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>In order to build an EMF you need to do something like:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>{code}</p><p> public EntityManagerFactory buildEntityManagerFactory(DataSource datasource) { </p><p>        Ejb3Configuration ejbconf = new Ejb3Configuration();</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        ejbconf.setDataSource(datasource);</p><p>        ejbconf.setProperty("hibernate.dialect", "org.hibernate.dialect.MySQL5InnoDBDialect");</p><p>        ejbconf.setProperty("hibernate.show_sql", "false");</p><p>          </p><p>        //Make transactionally aware</p><p>        ejbconf.setProperty("hibernate.transaction.manager_lookup_class", "org.hibernate.transaction.JBossTransactionManagerLookup");</p><p>        ejbconf.setProperty("jta.UserTransaction", "java:comp/UserTransaction");</p><p>        ejbconf.setProperty("hibernate.current_session_context_class", "jta");</p><p>        ejbconf.setProperty(HibernatePersistence.TRANSACTION_TYPE, PersistenceUnitTransactionType.JTA.name());</p><p>        </p><p>        //Add caching</p><p>        ejbconf.setProperty("hibernate.cache.provider_class", "HibernateEhCacheProviderClass");</p><p>        ejbconf.setProperty("hibernate.cache.use_second_level_cache", "true");</p><p>        ejbconf.setProperty("net.sf.ehcache.configurationResourceName", "META-INF/ehcache.xml");</p><p>      </p><p>        //Add you entity beans here</p><p>        ejbconf.addAnnotatedClass(SomeEntityBean.class);</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        return  ejbconf.buildEntityManagerFactory();</p><p>{code}</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Knocking up a datasource with DBCP looks like:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>{code} </p><p>    public DataSource buildDatasource(String connectionUrl) {</p><p>        // Create base connection factory that produces raw db connections.</p><p>        ConnectionFactory connectionFactory = new DriverManagerConnectionFactory(connectionUrl, libraryUser,</p><p>                libraryPassword);</p><p>        </p><p>        // Object pool for pooling raw connections</p><p>        GenericObjectPool connPool = new GenericObjectPool();</p><p>        connPool.setMaxActive(maxShardConns);</p><p>        connPool.setMinIdle(minShardConns);</p><p>        connPool.setMaxIdle(maxIdleConns);</p><p>        connPool.setMinEvictableIdleTimeMillis(shardConnTimeOutMins * 60 * 1000);</p><p>        connPool.setTestOnBorrow(true);</p><p>        </p><p>        connPool = new InstrumentedObjectPool(extractServerName(connectionUrl), connPool);</p><p>        </p><p>        String connectionValidationSql = "SELECT 1;";</p><p>        KeyedObjectPoolFactory preparedStatementPool = null;</p><p>        Boolean defaultConnectionsToReadOnly = false;</p><p>        Boolean defaultConnectionsToAutoCommit = false;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        TransactionManager transactionManager;</p><p>        try {</p><p>            transactionManager = (TransactionManager) InitialContext.doLookup("java:/TransactionManager");</p><p>        } catch (NamingException e) {</p><p>            throw new RuntimeException("Unable to lookup transaction manager", e);</p><p>        }</p><p>        </p><p>        LocalXAConnectionFactory transactionFactory = new LocalXAConnectionFactory(transactionManager,</p><p>                connectionFactory);</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        // Create factory to manage the connectionPool</p><p>        PoolableManagedConnectionFactory poolableConnectionFactory = new PoolableManagedConnectionFactory(</p><p>                transactionFactory, connPool, preparedStatementPool, connectionValidationSql,</p><p>                defaultConnectionsToReadOnly, defaultConnectionsToAutoCommit);</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        ManagedDataSource dataSource = new ManagedDataSource(connPool, transactionFactory.getTransactionRegistry());</p><p>                </p><p>        return dataSource;</p><p>{code}</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Using these in combination will give you a transactionally aware EMF with connection pooling.</p></div>
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